题目内容
下列各题合并同类项的结果是否正确?把错误的改正过来.
(1)m3+m3=m6;
(2)3a+2b=5ab;
(3)5a2-3a2=2;
(4)3xy-3xy=0;
(5)6ab2-3ab2=3ab2;
(6)9n2-12n2=3n2.
(1)m3+m3=m6;
(2)3a+2b=5ab;
(3)5a2-3a2=2;
(4)3xy-3xy=0;
(5)6ab2-3ab2=3ab2;
(6)9n2-12n2=3n2.
(1)错误,应为:m3+m3=2m3;
(2)错误,3a和2b不是同类项,不能合并;
(3)错误,应为:5a2-3a2=2a2;
(4)正确;
(5)正确;
(6)错误,应为:9n2-12n2=-3n2.
(2)错误,3a和2b不是同类项,不能合并;
(3)错误,应为:5a2-3a2=2a2;
(4)正确;
(5)正确;
(6)错误,应为:9n2-12n2=-3n2.
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